March 1992
Volume 33, Issue 3
Free
Articles  |   March 1992
Supernormal cone electroretinograms in central retinal vein occlusion.
Author Affiliations
  • P Gouras
    Department of Ophthalmology, Columbia University, New York, New York 10032.
  • C J MacKay
    Department of Ophthalmology, Columbia University, New York, New York 10032.
Investigative Ophthalmology & Visual Science March 1992, Vol.33, 508-515. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      P Gouras, C J MacKay; Supernormal cone electroretinograms in central retinal vein occlusion.. Invest. Ophthalmol. Vis. Sci. 1992;33(3):508-515.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

In 12 successive cases of unilateral central retinal vein occlusion (CRVO), the strongly light-adapted cone electroretinogram (both a- and b-wave) was always slower and larger (supernormal) to long-wave stimuli compared with that of the unaffected eye. This supernormality became less as the level of light adaptation decreased; in the dark-adapted state, long-wave stimuli produced subnormal responses from the affected eye in all but two subjects. This supernormality was not caused by ineffectiveness of the adapting light related to a reduced cone quantal catch because it occurred in the dark. At any one state of adaptation, the supernormality increased with the wavelength of stimulation, paralleling the relative absorption ratio of long-middle wavelength-sensitive cones. This suggests that cones, especially long wavelength-sensitive cones, are less able to reduce their responsiveness to light with increasing levels of light adaptation in a retina affected by CRVO.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×